CN110737350B - Display device with touch sensor - Google Patents

Display device with touch sensor Download PDF

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Publication number
CN110737350B
CN110737350B CN201910628480.9A CN201910628480A CN110737350B CN 110737350 B CN110737350 B CN 110737350B CN 201910628480 A CN201910628480 A CN 201910628480A CN 110737350 B CN110737350 B CN 110737350B
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China
Prior art keywords
touch
signal
electrode connected
driving
node
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Active
Application number
CN201910628480.9A
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Chinese (zh)
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CN110737350A (en
Inventor
金载升
李挥得
李杨植
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LG Display Co Ltd
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LG Display Co Ltd
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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
    • H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/124—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
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    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
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    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
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    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
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    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
    • H01L29/76—Unipolar devices, e.g. field effect transistors
    • H01L29/772—Field effect transistors
    • H01L29/78—Field effect transistors with field effect produced by an insulated gate
    • H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
    • H01L29/78645—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with multiple gate
    • G—PHYSICS
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    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
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    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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    • G09G2300/00—Aspects of the constitution of display devices
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    • G09G2300/0439—Pixel structures
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    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Human Computer Interaction (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Ceramic Engineering (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

Embodiments of the present disclosure may provide a display device including: a substrate including an active region in which pixels connected to gate lines and data lines intersecting each other are disposed, and a non-active region in which lines for transmitting signals for driving the plurality of pixels are disposed; a touch signal generation circuit provided on the inactive area and receiving a touch clock signal and outputting a touch driving signal; and a touch sensor unit for receiving the touch driving signal and generating touch information about a touch point on the active area.

Description

Display device with touch sensor
Cross Reference to Related Applications
The present application claims priority from korean patent application No.10-2018-0084393 filed on 7.19 of 2018, the entire contents of which are incorporated herein by reference as if fully set forth herein.
Technical Field
The present disclosure relates to a display device having a touch sensor.
Background
With the development of information society, the demand for display devices for displaying images has increased in various forms. For this purpose, various types of display devices, such as a liquid crystal display device (LCD), a plasma display device, and an organic light emitting display device (OLED), have been used.
The organic light emitting display device among these display devices has a self-emission characteristic, and has excellent response speed, viewing angle, and color reproducibility, and can be made thin.
The display device may operate in response to input signals received through various input devices such as a keyboard and a mouse. By touching the screen using the touch panel, the display device can intuitively and conveniently input a command of a user. The touch panel may be provided on a screen of the display device and allow a user to input a user's command by touching a specific point on the screen of the display device. Such a touch panel may be embedded in and integrated with a display device. A touch panel integrated in a display device may be referred to as a touch sensor.
The touch sensor includes a plurality of touch electrodes, and the touch electrodes may receive a touch driving signal through a touch line and output a touch sensing signal. In recent years, due to the trend of increasing the size of display devices, the number of touch electrodes provided on the display devices may increase, so that the number of touch lines for transmitting touch driving signals to the touch electrodes should increase. As a result, the number of touch driving signals output from the touch IC also increases. In addition, a plurality of touch driving signals may be simultaneously output to sense touches occurring at various points on the display device. As a result, since the touch driving circuit should output a large number of touch driving signals, a problem of an increase in the size of the touch driving circuit may occur.
Disclosure of Invention
It is an aspect of embodiments of the present disclosure to provide a display device including a touch sensor capable of reducing the size of a touch control unit.
It is another aspect of embodiments of the present disclosure to provide a display device having a touch sensor capable of reducing manufacturing costs.
It is another aspect of embodiments of the present disclosure to provide a display device including a thin touch sensor.
According to an aspect of the present disclosure, there may be provided a display device including: a substrate including an active region in which pixels connected to gate lines and data lines intersecting each other are arranged, and a non-active region in which lines for transmitting signals for driving a plurality of pixels are provided; a touch signal generation circuit provided on the inactive area and receiving a touch clock signal and outputting a touch driving signal; and a touch sensor unit for receiving the touch driving signal and generating touch information about a touch point on the active area.
According to another aspect of the present disclosure, there may be provided a display device including: a display panel including an active region in which gate lines and data lines are disposed, and a non-active region in which a touch signal generation circuit for receiving a touch clock signal and outputting a touch signal is disposed, and including a plurality of pixels arranged in a region where the gate lines and the data lines intersect each other; a display driving circuit for supplying a gate signal applied to the gate line and a driving signal corresponding to a data signal applied to the data line; a touch sensor unit including a plurality of touch electrodes for receiving a touch signal from the touch signal generation circuit and generating information about a touch point on the display panel; and a touch driving circuit for supplying the touch clock signal to the touch signal generating circuit.
According to an embodiment, the display device further includes: and a gate signal generating circuit for receiving the driving signal from the display driving circuit and generating a gate signal.
According to these embodiments, it is possible to provide a display device having a touch sensor capable of correctly recognizing a touch by causing a change in capacitance of surrounding points.
According to the embodiment, it is possible to provide a display device having a touch sensor capable of reducing the size of a touch control unit.
According to the embodiment, it is possible to provide a display device having a touch sensor capable of reducing manufacturing costs.
According to the embodiment, it is possible to provide a display device including a thin touch sensor.
Drawings
The above and other aspects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:
fig. 1 is a structural diagram showing an embodiment of a display device having a touch sensor unit according to the present embodiment;
FIG. 2 is a plan view illustrating one embodiment of the display panel shown in FIG. 1;
fig. 3 is a plan view showing a first embodiment of the touch sensor unit shown in fig. 1;
Fig. 4 is a plan view showing a second embodiment of the touch sensor unit shown in fig. 1;
fig. 5 is a conceptual diagram illustrating a first embodiment of the operation of the touch driving circuit and the touch signal generator shown in fig. 1;
fig. 6 is a conceptual diagram illustrating a second embodiment of the operation of the touch driving circuit and the touch signal generator shown in fig. 1;
fig. 7 is a block diagram illustrating an embodiment of the touch driving circuit in fig. 1;
FIG. 8 is a circuit diagram illustrating an embodiment of the touch signal generator shown in FIG. 2;
fig. 9 is a timing diagram illustrating a first embodiment of the operation of the touch signal generator shown in fig. 8;
fig. 10 is a timing diagram illustrating an embodiment of a touch signal output from the touch signal generator shown in fig. 6;
fig. 11 is a perspective view illustrating an embodiment of a structure in which a touch panel (TSP) is embedded in a display panel (DISP) according to an embodiment of the present invention;
fig. 12 is a plan view showing a first embodiment of a type of Touch Electrode (TE) provided on a display panel (DISP) according to an embodiment of the present invention;
fig. 13 is a plan view showing a second embodiment of the type of Touch Electrode (TE) provided on a display panel (DISP) according to an embodiment of the present invention;
Fig. 14 is a plan view showing a third embodiment of the type of Touch Electrode (TE) provided on a display panel (DISP) according to an embodiment of the present invention; and
fig. 15 is a cross-sectional view of an embodiment showing a cross section of a display device according to an embodiment of the present invention.
Detailed Description
Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the accompanying illustrative drawings. Where elements of a drawing are denoted by the same reference numerals, the same elements will be denoted by the same reference numerals although they are shown in different drawings. Further, in the following description of the present disclosure, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.
In addition, when describing the components of the present disclosure, terms such as first, second, A, B, (a), (b), and the like may be used herein. Each of these terms is not intended to define the essence, order, or sequence of the corresponding components, but is only used to distinguish the corresponding components from other components. Where a particular structural element is described as being "connected to," "coupled to," or "in contact with" another structural element, it should be construed that the other structural element may be "connected to," "coupled to," or "in contact with" the structural element, and that the particular structural element is directly connected to or in direct contact with the other structural element.
Fig. 1 is a structural diagram showing an embodiment of a display device having a touch sensor unit according to the present embodiment, and fig. 2 is a plan view showing one embodiment of the display panel shown in fig. 1.
Referring to fig. 1 and 2, the display device 100 may include: a display panel 110 for displaying an image; a display driving circuit 130a for supplying driving signals corresponding to a gate signal applied to the Gate Line (GL) and a data signal applied to the Data Line (DL); a touch sensor unit 120 including a plurality of touch electrodes for receiving touch signals from the touch signal generation circuit and generating information about touch points on the display panel 110; and a touch driving circuit 130b for supplying a touch clock signal to the touch signal generating circuit. Further, the display apparatus 100 may include a controller or control unit 140 for controlling the display driving circuit 130a and the touch driving circuit 130 b. The display driving circuit 130a, the touch driving circuit 130b, and the control unit 140 may be implemented as an integrated circuit, but may not be limited thereto. The display device 100 may be a liquid crystal display device or an organic light emitting display device, but is not limited thereto.
The display panel 110 may include an Active Area (AA) and an inactive area (NAA) disposed on the substrate 111. The active region (AA) may be disposed at the center of the substrate 111, and the inactive region (NAA) may be formed at the edge of the substrate 111, but may not be limited thereto. The plurality of Gate Lines (GL) and the plurality of Data Lines (DL) are arranged to intersect each other, and the plurality of sub-pixels (P) may be arranged in regions where the plurality of Gate Lines (GL) intersect the plurality of Data Lines (DL). In the case where the display device 100 is an organic light emitting display device, each sub-pixel (P) of the display panel 110 may include a light emitting element and a pixel circuit (not shown) for supplying a driving current to the light emitting element. The light emitting element may be an Organic Light Emitting Diode (OLED), but is not limited thereto. The organic light emitting diode may include an organic layer, and anode and cathode electrodes through which current flows in the organic layer. The pixel circuits may be connected to a power supply or a line for transmitting a signal. The pixel circuit may be connected to a Gate Line (GL) for transmitting a gate signal and a Data Line (DL) for transmitting a data signal. Further, the pixel circuit may receive a data signal in response to the gate signal, and may generate and supply a driving current to the light emitting element. In addition, the pixel circuit may be connected to a separate power line (not shown) to receive a driving current. The touch electrode may be disposed on an upper portion of the Active Area (AA). The in-panel Gate (GIP) may be disposed in the non-active area (NAA), and the in-panel Gate (GIP) may transmit a gate signal to the pixel in response to a signal received from the circuit unit shown in fig. 1. The power line, the clock line, the Gate Line (GL), the Data Line (DL), and the touch line may be disposed in the non-active area (NAA), however, the present invention is not limited thereto. Further, in the non-active area (NAA), a light emitting layer and a cathode electrode included in the pixel may be provided. The Active Area (AA) and the non-active area (NAA) may also be denoted herein as display area and non-display area, respectively.
The pads 112 may be disposed under an inactive area (NAA) of the substrate 111, as shown in fig. 2. The pads 112 may be connected to output terminals of the display driving circuit 130a and the touch driving circuit 130b, respectively. The region where the pads 112 are arranged on the substrate 111 may be referred to as a pad region. The pad 112 is shown connected to the data line DL, but is not limited thereto. The pads 112 may be provided to correspond to all lines for transmitting and receiving to and from the display driving circuit 130a and the touch driving circuit 130b shown in fig. 1.
The display driving circuit 130a may receive the data control signal to generate the data signal, and may receive the gate control signal to output the gate signal. When the gate signal generating circuit 211 is disposed on the display panel 110, the display driving circuit 130a may transmit a gate control signal to the gate signal generating circuit 211 to output a gate signal. The gate signal generating circuit 211 may be referred to as an in-panel Gate (GIP). The gate control signal may be a clock, a start pulse, or a synchronization signal. However, the present invention is not limited thereto.
The touch sensor unit 120 may sense a touch point of the display panel 110. The touch sensor unit 120 may include a plurality of touch electrodes disposed on the display panel 110. Here, the touch sensor unit 120 is shown as one component on the display panel 110, but this is conceptual only and is not limited thereto.
The touch driving circuit 130b may transmit/receive a touch signal to/from the touch sensor unit 120 in response to a touch control signal. The touch signals may include touch driving signals and touch sensing signals.
The display driving circuit 130a and the touch driving circuit 130b may be connected to the display panel 110 in the form of a Chip On Film (COF). That is, the display driving circuit 130a and the touch driving circuit 130b are disposed on the respective films 131, and the films 131 may be connected to the substrate 111. The film 131 may be connected to a Source Printed Circuit Board (SPCB) 132 and the display driving circuit 130a and the touch driving circuit 130b may receive signals through the SPCB 132. Here, although an embodiment in which the number of display driving circuits 130a and the number of touch driving circuits 130b are two is shown as an example, the present invention is not limited thereto. Although the display driving circuit 130a and the touch driving circuit 130b are shown to be alternately arranged, the present invention is not limited thereto. The number of display driving circuits 130a and the number of touch driving circuits 130b are shown to be the same, but the present invention is not limited thereto. The number of display driving circuits 130a and the number of touch driving circuits 130b may be determined depending on the size and/or resolution of the display panel 110 and the size of the touch sensor unit 120.
The display device 100 may further include a control unit 140. The control unit 140 may control the display driving circuit 130a and the touch driving circuit 130b. The control unit 140 may include a timing controller (T-CON) 140a and a Micro Control Unit (MCU) 140b. The T-CON 140a and the MCU 140b may control the display driving circuit 130a and the touch driving circuit 130b, respectively. The control unit 140 may be disposed on a Control Printed Circuit Board (CPCB) 141, and the CPCB 141 may be connected to the SPCB 132 through a Flexible Flat Circuit (FFC) 142.
Fig. 3 is a plan view showing a first embodiment of the touch sensor unit shown in fig. 1.
Referring to fig. 3, the touch sensor unit 120 may be disposed on the substrate 111, and may include a plurality of first electrodes TEa and a plurality of second electrodes TEb. The plurality of first electrodes TEa may correspond to touch driving electrodes, and the plurality of second electrodes TEb may correspond to touch sensing electrodes. The plurality of first electrodes TEa are connected by the connection portion 322 in the row direction to form a plurality of touch electrode lines in the row direction, and the plurality of second electrodes TEb may be connected by the connection portion 322 in the column direction to form a plurality of touch electrode lines. Here, the number of the first electrodes teas and the number of the second electrodes TEb may correspond to the size of the substrate 111, and are not limited to the illustrated example.
The first electrode TEa may receive a touch driving signal, and the second electrode TEb may transmit a touch sensing signal corresponding to the touch driving signal. The first electrode TEa and the second electrode TEb may be formed on the same layer on the display panel 110, however, the present invention is not limited thereto.
The first electrode TEa may be connected to the touch lines 321a and 321b, and the second electrode TEb may be connected to the touch line 321c. The touch lines 321a and 321b connected to the first electrode TEa may transmit touch driving signals from the touch driving circuit 130b shown in fig. 1 to the first electrode TEa. The touch line 321c connected to the second electrode TEb may transmit a touch sensing signal to the touch driving circuit 130b shown in fig. 1. Also, the touch line 321b connected to the first electrode TEa may be connected to a touch signal generation circuit.
The connection portion 322 may connect one first electrode TEa to the other first electrode. In addition, the connection portion 322 may connect one second electrode TEb to the other second electrode. The connection portions 322 intersect each other. Accordingly, in order to prevent the first electrode TEa and the second electrode TEb from being directly connected to each other, the connection portion 322 connecting the first electrode TEa may be formed on a different layer from the first electrode TEa and the second electrode TEb, and the first electrode TEa and the connection portion 322 may be connected through a via hole. The connection portion 322 connecting the second electrode TEb may be formed on the same layer as the first electrode TEa and the second electrode TEb to connect the second electrode TEb in the same layer. For this purpose, an insulating layer (not shown) may be disposed between the connection portion 322 connecting the first electrode TEa and the connection portion 322 connecting the second electrode TEb.
The first electrode TEa and the second electrode TEb may be formed by patterning a conductive metal layer. The first electrode TEa and the second electrode TEb may be formed of a transparent material such as Indium Tin Oxide (ITO). The patterned first and second electrodes TEa and TEb may include electrode patterns formed in a mesh form, and the first and second electrodes TEa and TEb may include a plurality of openings. The light emitted from the display device may be transmitted through the first electrode TEa and the second electrode TEb, or may be emitted to the outside through the first electrode TEa and the second electrode TEb made of ITO electrodes or a plurality of openings included in the first electrode TEa and the second electrode TEb.
The pattern of the first electrode TEa and the second electrode TEb formed in the mesh shape may be referred to as a touch electrode line. The first electrode TEa and the second electrode TEb may be connected to a driving line 321a for applying a driving signal, and a sensing line 321b, and a sensing signal generated corresponding to a touch sensed by the touch electrode is transmitted to the sensing line 321b.
Fig. 4 is a plan view showing a second embodiment of the touch sensor unit shown in fig. 1.
Referring to fig. 4, the touch sensor unit 120 may be disposed on the substrate 111, and a plurality of touch electrodes TE having predetermined regions may be arranged in a matrix form on the substrate 111. In addition, each touch electrode TE may be connected to a plurality of touch lines 420, which receive touch sensing signals from the touch electrode TE. The touch line 420 may be disposed under the touch electrode TE and may touch a portion of an area of the touch electrode TE. The touch electrode TE and the touch line 420 may be installed in the display panel 110 such that the display device does not include a separate touch panel on the display panel 110, and thus, a thin display device may be implemented. The touch line 420 may be connected to a touch signal generation circuit.
Fig. 5 is a conceptual diagram illustrating a first embodiment of the operation of the touch driving circuit and the touch signal generator shown in fig. 1.
Referring to fig. 5, the touch driving circuit 530 may output one touch clock TCLK, and the touch signal generating circuit 522 may generate a plurality of touch driving signals TX1, TX2, TXn-1, TXn using one touch clock TCLK received from the touch driving circuit 530. The plurality of touch driving signals output from the touch signal generation circuit 522 may be supplied to the plurality of touch lines 321b shown in fig. 3 or the touch line 420 shown in fig. 4, respectively. Sequential output of the plurality of touch driving signals TX1, TX2, TXn-1, TXn using one touch clock TCLK may be referred to as single touch driving. Here, the touch signal generation circuit 522 is shown as one block, but the present invention is not limited thereto, and one touch signal generation circuit 522 may be connected to one touch driving line.
Fig. 6 is a conceptual diagram illustrating a second embodiment of the operation of the touch driver circuit and the touch signal generator shown in fig. 1.
Referring to fig. 6, the touch driving circuit 630 may output two touch clocks TCLK1 and TCLK2, and the touch signal generating circuit 622 may generate and output a plurality of touch driving signals TX1, TX2, i.e., TXn-1, TXn using the two touch clocks TCLK1 and TCLK2 received from the touch driving circuit 630. For multiple touch drive lines that receive multiple touch drive signals TX1, TX2, TXn-1, TXn, two lines are set as one group, and each group may receive touch drive signals sequentially. Here, the two touch driving lines corresponding to one group may be touch driving lines adjacent to each other. For example, if sixteen touch driving lines are arranged, the first and second touch driving lines may be one group and the third and fourth touch driving lines may be another group. The touch signal generation circuit 622 may receive the two touch clocks TCLK1 and TCLK2 and simultaneously output the two touch driving signals TX1 and TX2 to the first and second touch driving lines. The touch signal generation circuit 622 may receive the two touch clocks TCLK1 and TCLK2 and simultaneously output the two touch driving signals TX3 and TX4 to the third and fourth touch driving lines. In this way, the touch driving signal can be transmitted to all the touch driving lines.
Here, the number of touch clocks TCLK1 and TCLK2 output to the touch driving circuit 630 is shown as two, but is not limited thereto. For example, the number of touch clocks TCLK1 and TCLK2 output to the touch signal generating circuit 622 may be four, six, eight, or the like. In addition, the number of touch driving lines arranged as a group may correspond to the number of touch clocks TCLK1 and TCLK2. That is, if the number of touch clocks output to the touch signal generation circuit 622 is four, the number of touch driving lines set as a group may be four. Multiple touch drive lines that simultaneously receive two or more touch drive signals may be referred to as multi-touch drive.
Fig. 7 is a block diagram illustrating an embodiment of the touch driving circuit in fig. 1.
Referring to fig. 7, the touch driving circuit 730 may output a first power supply VDD, a second power supply VSS, a first control signal VST, a second control signal RST, and two touch clocks TCLK1 and TCLK2. The voltage level of the first power supply VDD may be higher than the voltage level of the second power supply VSS. The second power source VSS may be grounded.
In the case where the touch driving circuit 730 is driven by a single touch to sense one touch point during one touch sensing period, the control unit 140 may output one touch clock TCLK1. In the case where the touch driving circuit 730 is driven by multi-touch to sense a plurality of touch points during one touch sensing period, two touch clocks TCLK1 and TCLK2 may be output. In order to apply touch signals to four touch driving lines simultaneously in multi-touch, the touch driving circuit 730 should be able to output four touch clocks. That is, the touch driving circuit 730 may be able to determine and output the number of touch clocks corresponding to the number of touch driving lines that simultaneously receive the touch signal. The number of output pins of the touch clock may be determined according to the number of touch clocks simultaneously output by the touch driving circuit 730.
The touch driving circuit 730 may output only the touch clock without outputting the touch driving signal. As a result, an output terminal for outputting a touch driving signal may not be required. Assuming that the control unit 140 outputs the touch driving signal and sixteen touch lines for supplying the touch driving signal to the touch sensor unit 120 are provided, the touch driving circuit 730 may need to include sixteen pins connected to 16 touch lines and outputting the touch driving signal. However, if the touch driving circuit 730 does not output the touch driving signal, only one output terminal for outputting one touch clock is required in the case of single touch driving. Similarly, in the case of a multi-touch drive in which two touch clock signals are output in parallel, the number of output terminals for outputting the touch clock signals may be two, and in the case of a multi-touch drive in which four touch clock signals are output in parallel, the number of output terminals for outputting the touch clock signals may be four. Accordingly, if the touch driving circuit 730 does not output the touch driving signal, the number of output pins of the touch driving circuit 730 may be reduced, thereby implementing a small-sized touch driving circuit 730. Further, since the touch driving circuit 730 having a small size can be utilized, the manufacturing cost of the display device 100 can be reduced.
Fig. 8 is a circuit diagram illustrating an embodiment of the touch signal generator shown in fig. 2.
Referring to fig. 8, the touch signal generation circuit 820 may include: a first transistor T1 having: a first electrode connected to the first input terminal IN1, the first power supply VDD being supplied to the first input terminal IN1; a second electrode connected to the first node (Q); and a gate electrode connected to the second input terminal IN2, the first control signal VST being transmitted to the second input terminal IN2; and a second transistor T2 having: a first electrode connected to a first node (Q); a second electrode connected to the third input terminal IN3, a second power source being supplied to the third input terminal IN3; and a gate electrode connected to the second node (QB). The touch signal generation circuit 820 may include: a third transistor T3 having: a first electrode connected to a first node (Q); a second electrode connected to the third input terminal IN3, the second power source VSS being input to the third input terminal IN3; and a gate electrode connected to the fourth input terminal IN4, the second control signal RST being transmitted to the fourth input terminal IN4; a fourth transistor T4 having: a first electrode connected to the first input terminal IN1, the first power VDD being transmitted to the first input terminal IN1; a second electrode connected to a second node (QB); and a gate electrode connected to the first input terminal IN1; a fifth transistor T5 having a first electrode connected to the second node (QB), a second electrode connected to the third input terminal IN3, and a gate electrode connected to the first node (Q); a sixth transistor T6 having: a first electrode connected to the fifth input terminal IN5, the touch clock signal TCLK being input to the fifth input terminal IN5; a second electrode connected to the output terminal OUT; a gate electrode connected to the first node (Q); and a seventh transistor T7 having a first electrode connected to the output terminal OUT, a second electrode connected to the third input terminal IN3, and a gate electrode connected to the second node (QB). The voltage level of the first power supply VDD may be higher than the voltage level of the second power supply VSS. Also, the second power source VSS may correspond to the ground GND.
The voltage level of the touch driving signal output from the touch signal generation circuit 820 may be higher than the voltage level of the touch clock signal TCLK input from the fifth input terminal IN 5. The voltage level of the trigger driving signal may be output to be higher than the voltage level of the touch clock signal TCLK, corresponding to the parasitic capacitor CP1 formed between the fifth input terminal IN5 and the first node (Q) and the parasitic capacitor CP2 formed between the output terminal OUT and the first node (Q). .
Fig. 9 is a timing diagram illustrating a first embodiment of the operation of the touch signal generator shown in fig. 8.
In fig. 9, (a) is a timing chart showing an example of a signal input to the touch signal generation circuit 820, and (b) is a timing chart showing voltages applied to the first node (Q) and the second node (QB) of the touch signal generation circuit 820. (c) Is a timing chart showing the voltage of the output terminal OUT of the touch signal generation circuit 820. As shown in (a), the touch signal generation circuit 820 may not receive the first control signal VST, the second control signal RST, and the touch clock signal TCLK in the first time interval a. The touch signal generation circuit 820 may receive the first control signal VST and not receive the second control signal RST and the touch clock signal TCLK in the second time interval B. The touch signal generation circuit 820 may receive the touch clock signal TCLK in the third time interval C without receiving the first control signal VST and the second control signal RST. The touch signal generation circuit 820 may receive the second control signal RST in the fourth time interval D without receiving the first control signal VST and the touch clock signal TCLK.
The first transistor T1 and the fourth transistor T4 may be in an off state if the touch signal generation circuit 820 does not receive the first control signal VST and the second control signal RST in the first time interval a. If the first transistor T1 is turned off, the first power supply VDD is not transferred to the first node (Q). At this time, the fourth transistor T4 may remain in an on state, and the voltage of the first power supply VDD may be applied to the second node (QB). Thus, as shown in (b), the second node (QB) may be in a high state in the first time interval a. The second transistor T2 may be in a conductive state if the second node (QB) is in a high state. If the second transistor T2 is in an on state, the voltage of the second power source VSS may be transferred to the first node (Q). As a result, the first node (Q) may be in a low state, as shown in (b). When the first node (Q) is in a low state, the sixth transistor T6 may be in an off state. Then, as shown in (c), the output terminal OUT may become a low state.
In addition, as shown in (a), the first control signal VST in the high state is transmitted to the touch signal generation circuit 820, and the second control signal RST is not transmitted in the second time interval B. In addition, the touch clock signal TCLK is not transmitted. If the first control signal VST in the high state is transmitted, the first transistor T1 is turned on, and the voltage of the first power supply VDD is transmitted to the first node (Q). Thus, as shown in (b), the voltage of the first node (Q) may rise to reach the voltage level of the first power supply VDD. When the voltage level of the first node (Q) becomes the voltage of the first power supply VDD, the fifth transistor T5 may be turned on. When the fifth transistor T5 is turned on, the second power is supplied to the second node (QB), and the second node (QB) has a voltage level of the second power, as shown in (b). When the second node (QB) has the voltage level of the second power source, the second transistor T2 may be in an off state. Further, the seventh transistor T7 may be in an off state. Although the sixth transistor T6 may be turned on by the voltage of the first node (Q), since the touch clock signal TCLK is not transmitted and a signal may not be output to the output terminal OUT, as shown in (c). In addition, the first power VDD may not be output from the touch IC 730 in the second time interval B.
In addition, as shown in (a), in the third time interval C, the first control signal VST and the second control signal RST may not be transmitted, and the touch clock signal TCLK may be transmitted. The first transistor T1 may be in an off state if the first control signal VST is not transmitted. The third transistor T3 may be in an off state if the second control signal RST is not transmitted. The voltage of the first node (Q) may maintain the high voltage level of the second period B even though the first transistor T1 is turned off because the third transistor T3 is in an off state. Accordingly, the fifth transistor T5 may be maintained in a turned-on state such that the voltage of the second node (QB) may have the voltage level of the second power supply. As a result, the seventh transistor T7 can maintain the off state. At this time, when the touch clock signal TCLK is input through the fifth input terminal IN5, the voltage of the first node (Q) may be increased through the parasitic capacitor CP 1. As a result, the voltage level of the first node (Q) may be higher than the voltage level of the first power supply VDD. When the voltage level of the first node (Q) becomes high, the voltage level of the output terminal OUT may also become high. Accordingly, the voltage level of the touch driving signal output from the output terminal OUT may be higher than the voltage level of the touch clock signal TCLK. In addition, the touch clock signal TCLK may be a plurality of square waves having a constant frequency. For example, if the frequency of the touch clock signal TCLK is 200kHz and the voltage level is between 0 and 6V, the voltage level of the touch driving signal may be higher than 6V through the first parasitic capacitor CP1 and the second parasitic capacitor CP 2. .
In addition, as shown in (a), in the fourth time interval D, the first control signal VST and the touch clock signal TCLK are not transmitted, and the second control signal RST is transmitted in a high state. Since the first control signal VST is not transmitted, the first transistor T1 may maintain an off state. However, since the second control signal RST is transmitted, the third transistor T3 is turned on and the first node (Q) may be discharged through the third transistor T3. The fifth transistor T5 and the sixth transistor T6 may be turned off if the voltage of the first node (Q) discharges. When the fifth transistor T5 is turned off, the first power supply VDD may be in a high state through the fourth transistor T4, and thus the seventh transistor T7 may be in an on state. Accordingly, the output terminal OUT may have a voltage level of the second power source VSS. Although the maximum values of the voltage levels of the first control signal VST, the second control signal RST, and the touch clock TCLK are shown as the voltage level of the first power supply VDD, the present invention is not limited thereto.
Fig. 10 is a timing diagram illustrating an embodiment of a touch signal output from the touch signal generator shown in fig. 6.
Referring to fig. 10, the touch signal generation circuit 622 may perform a multi-point driving in which touch signals are simultaneously supplied to two touch driving lines. The touch signal generation circuit 622 may output a plurality of touch drive signals TX1, & gt, TX18. The number of touch driving signals output from the touch signal generation circuit 622 may be shown as eighteen, but the present invention is not limited thereto.
The first touch driving signal TX1 and the second touch driving signal TX2 may be simultaneously output. The first and second touch driving signals TX1 and TX2 may be output in opposite phases to each other in the first time interval TD1 and may be output in the same phase in the second time interval TD 2. Touch signal generation circuit 622 may determine the phases of the plurality of touch drive signals TX1,..and TX18 corresponding to the +, -code. The touch signal generation circuit 622 may simultaneously output the third touch driving signal TX3 and the fourth driving signal TX4. The third and fourth touch driving signals TX3 and TX4 may partially overlap the first and second touch driving signals TX1 and TX2. For example, the first touch driving signal TX1 and the third touch driving signal TX3 may overlap in the second time interval TD 2. The third touch driving signal TX3 and the fourth touch driving signal TX4 may be opposite in phase to each other in the second time interval TD2, and may have the same phase in the third time interval TD 3. The plurality of touch driving signals TX1, TX18 may be output in the same manner as described above. Although it is illustrated that two touch driving signals are simultaneously output, the number of touch driving signals simultaneously output by the touch signal generation circuit 622 may not be limited thereto.
Fig. 11 is a perspective view illustrating an embodiment of a structure in which a touch panel (TSP) is embedded in a display panel (DISP) according to an embodiment of the present invention.
Referring to fig. 11, in an Active Area (AA) of a display panel (DISP), a plurality of SUB-pixels (SP) may be arranged on a Substrate (SUB). Each sub-pixel (SP) may include a light emitting Element (ED), a first transistor (M1) for driving the light emitting Element (ED), a second transistor (M2) for transmitting a data Voltage (VDATA) to a first node (N1) of the first transistor (M1), and a storage capacitor (Cst) for maintaining a constant voltage for one frame.
The first transistor (M1) may include a first node (N1) to which the data voltage is applied, a second node (N2) electrically connected to the light emitting Element (ED), and a third node (N3), to which the driving voltage (ELVDD) from the Driving Voltage Line (DVL) is applied. The first node (N1) may be a gate node, the second node (N2) may be a source node or a drain node, and the third node (N3) may be a drain node or a source node. The first transistor (M1) may also be referred to as a driving transistor for driving the light emitting Element (ED).
The light emitting Element (ED) may include a first electrode (e.g., an anode electrode), a light emitting layer, and a second electrode (e.g., a cathode electrode). The first electrode may be electrically connected to a second node (N2) of the first transistor (M1), and a reference voltage (ELVSS) may be applied to the second electrode. The light emitting layer in the light emitting Element (ED) may include a plurality of layers. The light emitting layer may be an organic light emitting layer including an organic material. In this case, the light emitting Element (ED) may be an Organic Light Emitting Diode (OLED).
The second transistor (M2) may be controlled to be turned on and off by a SCAN Signal (SCAN) applied via the Gate Line (GL), and the second transistor (M2) may be electrically connected between the first node (N1) of the first transistor (M1) and the Data Line (DL). The second transistor (M2) may also be referred to as a switching transistor. The second transistor (M2) is turned on by a SCAN Signal (SCAN) and transmits a data Voltage (VDATA) supplied from a Data Line (DL) to a first node (N1) of the first transistor (M1).
The storage capacitor (Cst) may be electrically connected between the first node (N1) and the second node (N2) of the first transistor (M1).
Each sub-pixel (SP) may have a 2T1C structure including two transistors (M1, M2) and one capacitor (Cst), as shown in fig. 11, and in some cases, one or more transistors or one or more capacitors.
The storage capacitor (Cst) may not be a parasitic capacitor (e.g., cgs, cgd), which is an internal capacitor existing between the first node (N1) and the second node (N2) of the first transistor (M1), but may be an external capacitor intentionally designed outside the first transistor (M1).
Each of the first transistor (M1) and the second transistor (M2) may be an n-type transistor or a p-type transistor.
As described above, circuit elements such as a light emitting Element (ED), two or more transistors (M1, M2), and one or more capacitors (Cst) may be arranged in the display panel (DISP). Such a circuit element, particularly the light emitting element ED, may be susceptible to external moisture or oxygen, and thus, a package (ENCAP) or a package layer for preventing external moisture or oxygen from being introduced into the circuit element, particularly the light emitting element ED, may be provided on the display panel (DISP).
The Encapsulation (ENCAP) may be a single layer or may be multiple layers.
For example, in the case where the Encapsulation (ENCAP) includes multiple layers, the Encapsulation (ENCAP) may include one or more inorganic encapsulation layers and one or more organic encapsulation layers. As a specific example, the Encapsulation (ENCAP) may include a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer. Here, the organic encapsulation layer may be located between the first inorganic encapsulation layer and the second inorganic encapsulation layer.
The first inorganic encapsulation layer may be formed on the second electrode (e.g., cathode electrode) so as to be closest to the light emitting Element (ED). The first inorganic encapsulation layer may be formed of an inorganic insulating material capable of low temperature deposition, such as silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), or aluminum oxide (Al 2O 3). Accordingly, since the first inorganic encapsulation layer is deposited in a low temperature atmosphere, damage to the light emitting layer (organic light emitting layer) susceptible to high temperature can be prevented during the deposition of the first inorganic encapsulation layer.
The organic encapsulation layer may have a smaller area than the first inorganic encapsulation layer, and may be formed to expose both ends of the first inorganic encapsulation layer. The organic encapsulation layer may serve as a buffer for relieving stress between respective layers due to bending of the touch display device, and may enhance planarization performance. For example, the organic encapsulation layer may be formed of an organic insulating material such as acrylic, epoxy, polyimide, polyethylene, or silicon oxycarbide (SiOC).
The second inorganic encapsulation layer may be formed on the organic encapsulation layer so as to cover upper and side surfaces of the organic encapsulation layer and the first inorganic encapsulation layer, respectively. Accordingly, the second inorganic encapsulation layer may minimize or prevent external moisture or oxygen from penetrating into the first inorganic encapsulation layer and the organic encapsulation layer. The second inorganic encapsulation layer may be formed of, for example, an inorganic insulating material such as silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), or aluminum oxide (Al 2O 3).
In the touch display device according to an embodiment of the present invention, the touch panel (TSP) may be formed on the Encapsulation (ENCAP).
That is, in the touch display device, a touch sensor structure such as a plurality of Touch Electrodes (TE) forming a touch panel (TSP) may be disposed on a package (ENCAP).
In touch sensing, a touch driving signal or a touch sensing signal may be applied to a Touch Electrode (TE). Accordingly, in touch sensing, a potential difference may be formed between the Touch Electrode (TE) and the cathode electrode with a package (ENCAP) disposed therebetween, and unnecessary parasitic capacitance may be generated. Since the parasitic capacitance may reduce touch sensitivity, a distance between the Touch Electrode (TE) and the cathode electrode may be set to a predetermined value (e.g., 5 μm) or more. For this, for example, the thickness of the encapsulation layer (ENCAP) may be designed to be at least 5 μm or more.
Fig. 12 is a plan view showing a first embodiment of the type of Touch Electrode (TE) provided on the display panel (DISP) according to an embodiment of the present invention, and fig. 13 is a plan view showing a second embodiment of the type of Touch Electrode (TE) provided on the display panel (DISP) according to an embodiment of the present invention. Fig. 14 is a plan view showing a third embodiment of the type of Touch Electrode (TE) provided on a display panel (DISP) according to an embodiment of the present invention.
As shown in fig. 12, each of the Touch Electrodes (TE) provided on the display panel (DISP) may be a plate-shaped electrode metal having no opening. In this case, each Touch Electrode (TE) may be a transparent electrode. That is, each Touch Electrode (TE) may be composed of a transparent electrode material so that light emitted from a plurality of sub-pixels (SPs) disposed below may be transmitted upward.
Alternatively, as shown in fig. 13, each of the Touch Electrodes (TE) disposed on the display panel (DISP) may be patterned into a mesh type to form an Electrode Metal (EM) having two or more Openings (OA).
The Electrode Metal (EM) corresponds to a substantial Touch Electrode (TE) and is a portion to which a touch driving signal or a touch sensing signal is applied.
As shown in fig. 13, in the case where each Touch Electrode (TE) is an Electrode Metal (EM) patterned into a mesh type, two or more Openings (OA) may exist in the area of the Touch Electrode (TE).
Each of the at least two Openings (OA) in each Touch Electrode (TE) may correspond to a light emitting region of one or more sub-pixels (SP). That is, the plurality of Openings (OA) may be paths through which light emitted from the plurality of sub-pixels (SP) arranged below passes. Hereinafter, for convenience of explanation, it is assumed that each Touch Electrode (TE) is a mesh type Electrode Metal (EM).
The Electrode Metal (EM) corresponding to each Touch Electrode (TE) may be located on a bank disposed in an area other than the light emitting area of two or more sub-pixels (SP).
Meanwhile, as a method of forming the plurality of Touch Electrodes (TE), after forming the Electrode Metal (EM) into a wide mesh shape, the Electrode Metal (EM) may be cut into a predetermined pattern to electrically separate the Electrode Metal (EM) to thereby form the plurality of Touch Electrodes (TE).
The outline shape of the Touch Electrode (TE) may be square, such as diamond, or other shapes, such as triangle, pentagon, or hexagon.
Referring to fig. 14, in the region of each Touch Electrode (TE), there may be a mesh type Electrode Metal (EM) and at least one Dummy Metal (DM) separated from the mesh type Electrode Metal (EM).
The Electrode Metal (EM) is a portion corresponding to the substantial Touch Electrode (TE) and is a portion to which a touch driving signal is applied or a touch sensing signal is detected. Meanwhile, although the Dummy Metal (DM) may exist in the area of the Touch Electrode (TE), the touch driving signal is not applied to the Dummy Metal (DM) and the touch sensing signal is not detected at the Dummy Metal (DM). That is, the Dummy Metal (DM) may be an electrically floating metal portion.
Accordingly, the Electrode Metal (EM) may be electrically connected to the Touch Driving Circuit (TDC), but the Dummy Metal (DM) is not electrically connected to the Touch Driving Circuit (TDC).
At least one Dummy Metal (DM) may exist in a state of being disconnected from the Electrode Metal (EM) in each region of each Touch Electrode (TE).
Alternatively, the at least one Dummy Metal (DM) may exist only in a state of being disconnected from the Electrode Metal (EM) in a region of each of some of all the Touch Electrodes (TE). That is, the Dummy Metal (DM) may not exist in the area of some Touch Electrodes (TE).
As shown in fig. 13, regarding the effect of the Dummy Metal (DM), in the case where the dummy metal DM is not present in the area of the Touch Electrode (TE) and only the Electrode Metal (EM) is formed in a mesh type, a visibility problem may occur in which the outline of the Electrode Metal (EM) is visible on the display surface.
In contrast, as shown in fig. 14, in the case where one or more Dummy Metals (DM) exist in the region of the Touch Electrode (TE), the visibility problem of the outline of the Electrode Metal (EM) on the display surface can be prevented.
Further, the capacitance of each Touch Electrode (TE) may be adjusted to improve touch sensitivity by adjusting the presence or the number (dummy metal ratio) of the Dummy Metal (DM) of each Touch Electrode (TE).
Meanwhile, by cutting some points on the Electrode Metal (EM) formed in the area of one Touch Electrode (TE), the cut Electrode Metal (EM) may be formed of the Dummy Metal (DM). That is, the Electrode Metal (EM) and the Dummy Metal (DM) may be the same material formed in the same layer.
The touch display device according to an embodiment of the present invention may sense a touch based on a capacitance formed on a Touch Electrode (TE).
The touch display device according to an embodiment of the present invention may utilize a capacitance-based touch sensing method, which may sense a touch by a mutual capacitance-based touch sensing method or a self-capacitance-based touch sensing method.
In the case of the mutual capacitance-based touch sensing method, a plurality of Touch Electrodes (TE) may be classified into a driving touch electrode (transmitting touch electrode) for applying a touch driving signal and a sensing touch electrode (receiving touch electrode) for detecting a touch sensing signal and forming a capacitance with the driving touch electrode.
In the case of a mutual capacitance-based touch sensing method, a Touch Sensing Circuit (TSC) may detect the presence/absence of a touch and/or touch coordinates based on a change in capacitance (mutual capacitance) between a driving touch electrode and a sensing touch electrode generated according to the presence or absence of a pointer such as a finger, a pen, or the like.
In the case of the self-capacitance based touch sensing method, each Touch Electrode (TE) may be used as a driving touch electrode and a sensing touch electrode. That is, the Touch Sensing Circuit (TSC) applies a touch driving signal to one or more Touch Electrodes (TE), and detects a touch sensing signal through the Touch Electrode (TE) to which the touch driving signal is applied. And then, the Touch Sensing Circuit (TSC) may detect the presence or absence of a touch and/or touch coordinates by using a change in capacitance between the Touch Electrode (TE) and a pointer such as a finger and a pen and based on the sensed touch sensing signal. In the self-capacitance based touch sensing method, there is no distinction between driving a touch electrode and sensing the touch electrode.
As described above, the touch display device according to the embodiment of the present invention may sense a touch by a mutual capacitance-based touch sensing method or a self capacitance-based touch sensing method. Hereinafter, for convenience of explanation, a touch display device performing mutual capacitance-based touch sensing and having a touch sensor structure for this purpose is described as an example.
Fig. 15 is a cross-sectional view of an embodiment showing a cross-section of a display device according to an embodiment of the present invention.
Referring to fig. 15, a substrate 1100 may be divided into an active region 1000 and a pad region 2000. A thin film transistor, a gate line (not shown) for applying a gate signal to the thin film transistor, and a data line (not shown) for applying a data signal to the thin film transistor may be formed on the active region 1000. The substrate 1100 may be formed of polyamide, but is not limited thereto. In addition, the source electrode (not shown) and the drain electrode 111b of the thin film transistor may be formed when the data line is formed on the substrate 1100. The signal line 1110a extending from the pad region 2000 to the active region 1000 may be formed at the time of forming the data line. The signal line 1110a may be a pad 1010 exposed in the pad region 2000 and connected to an external device. However, the present invention is not limited thereto. The external device connected to the pad 1010 may be a data driver or a gate driver. The external device connected to the pad 1010 may be a Printed Circuit Board (PCB) on which the data driver and the gate driver are mounted, but is not limited thereto.
A planarization film 1120 may be formed on the drain electrode 1110b. The planarization film 1120 may be patterned, and the anode electrode 1130 disposed on the planarization film 1120 may be connected to the drain electrode 1110b disposed under the planarization film 1120. The bank 1140b may be formed on the anode electrode 1130 and the organic light emitting layer 1140a may be formed on the cavity formed in the bank 1140 b. The cathode electrode 1150 may be formed on the bank 1140b on which the organic light emitting layer 1140a is formed. The bank 1140b in which the organic light emitting layer 1140a is formed in the cavity may be referred to as a light emitting layer. The cathode electrode 1150 may be a common electrode. The first inorganic film 1160 may be formed on the cathode electrode 1150. When the first inorganic film 1160 is formed, a dam 1120a may be formed at a portion where the pad region 2000 and the active region 1000 are adjacent to each other. The dam 1120a may be formed when the planarization film 1120 is formed. Further, the dam 1120a may have a double-layered structure. When the first inorganic film 1160 is formed, the first inorganic film 1160 may be patterned using a mask. The first inorganic film 1160 may not cover the pad region 2000 by patterning. The first inorganic film 1160 may cover an upper portion of the dam 1120a. However, the present invention is not limited thereto. In addition, the region of the substrate 1100 with respect to the dam 1120a may be divided into an active region 1000 and a pad region 2000. However, the present invention is not limited thereto, and the pad region 2000 may be a region in which the signal line 1110a provided on the substrate 1100 is exposed or a conductor provided on the signal line 1110a is exposed. The conductor disposed on the signal line 1110a may be a second touch electrode 1230 described below.
The first organic film 1170 may be formed on the first inorganic film 1160. The first organic film 1170 may be provided as a thick layer on the organic light emitting film 1140a to protect the organic light emitting film 1140a, thereby making it possible to prevent foreign substances such as moisture from penetrating into the organic light emitting film 1140a. The first inorganic film 1160 may have a certain limitation to increase the thickness. Accordingly, the organic light emitting film 1140a can be protected by providing the first organic film 1170 on the first inorganic film 1160 to increase the thickness. The first organic film 1170 may be prevented from penetrating into the pad region 2000 through the dam 1120 a. .
The second inorganic film 1180 may be formed on the first organic film 1170. The second inorganic film 1180 may cover an upper portion of the dam 1120a formed by the first inorganic film 1160 and the planarization film 1120. The stacked first inorganic film 1160, first organic film 1170, and second inorganic film 1180 may be referred to as an encapsulation or encapsulation layer.
The touch buffer layer 1190 may be formed on the second inorganic film 1180. The touch sensor unit may be mounted on the package or the encapsulation layer by patterning the touch electrode on the package or the encapsulation layer. Damage to the encapsulation or encapsulation layer may occur during formation of the touch electrode on the encapsulation or encapsulation layer. To address this issue, a touch buffer layer 1190 may be formed on the encapsulation or encapsulation layer. The touch buffer layer 1190 may be formed of an inorganic film. The function of the touch buffer layer 1190 is not limited to preventing the package from being damaged in forming the touch electrode.
The first touch electrode 1210 and the second touch electrode 1230 may be formed on the touch buffer layer 1190. The first touch electrode 1210 and the second touch electrode 1230 may be a plurality of touch electrodes as shown in fig. 3. The connection portion 322 may be disposed on a different layer from the plurality of touch electrodes. The touch insulating film 1220 may be disposed under the touch electrode 1230. A contact hole may be formed in the touch insulating film 1220. The second touch electrode 1230 may be connected to the first touch electrode 1210 through a contact hole. The passivation layer 1240 may be formed on the second touch electrode 1230. The passivation layer 1240 may be an organic film or an inorganic film.
The touch buffer layer 1190 and the second inorganic film 1180 may be formed by being patterned when the first touch electrode 1210 is formed. The signal lines may be exposed by removing the second inorganic film 1180 and the touch buffer layer 1190 from the pad region 2000 using a patterning process. The exposed portion of the signal line may be referred to as a pad 1010. Accordingly, the area of the active region on the substrate 1100 can be widened and the area of the pad region can be reduced, so that a small frame region structure can be implemented.
After the first touch electrode 1210 is patterned, a touch insulating film 1220 is deposited. And then the second touch electrode 1230 may be patterned and formed on the touch insulation film 1220. At this time, the second touch electrode 1230 may be formed on the signal line 1110a exposed in the pad region 2000. Further, the signal line 1110a may be in contact with the second touch electrode 1230. Accordingly, a signal may be transmitted to the second touch electrode 1230 through the signal line 1110 a.
The foregoing description and drawings provide examples of the technical concepts of the present disclosure for illustrative purposes only. Those of ordinary skill in the art to which the present disclosure pertains will appreciate that various modifications and changes in form, such as combinations, separations, substitutions and alterations of the configurations are possible without departing from the essential characteristics of the present disclosure. Accordingly, the embodiments disclosed in the present disclosure are intended to illustrate the scope of the technical idea of the present disclosure, and the scope of the present disclosure is not limited by the embodiments. The scope of the present disclosure should be construed based on the appended claims, in such a way that all technical ideas included in the scope equivalent to the claims belong to the present disclosure.

Claims (14)

1. A display device, comprising:
a substrate including an active region in which pixels connected to gate lines and data lines intersecting each other are disposed and an inactive region in which lines for transmitting signals for driving a plurality of pixels are disposed;
a touch signal generation circuit provided on the inactive area and receiving a touch clock signal and outputting a touch driving signal; and
a touch sensor unit for receiving the touch driving signal and generating touch information about a touch point on the active area, and
Wherein the touch signal generation circuit receives two or more touch clock signals simultaneously and outputs touch driving signals corresponding to the two or more touch clock signals simultaneously, and
wherein the touch signal generation circuit outputs a first touch driving signal corresponding to the first touch clock and a second touch driving signal corresponding to the second touch clock simultaneously, and
wherein the touch signal generation circuit outputs the first touch driving signal and the second touch driving signal during a first time interval and a second time interval, and
the phase of the first touch driving signal is opposite to the phase of the second touch driving signal during the first time interval and is the same as the phase of the second touch driving signal during the second time interval.
2. The display device of claim 1, wherein a voltage level of the touch driving signal is higher than a voltage level of the touch clock signal.
3. The display device according to claim 1, wherein the touch signal generation circuit includes:
a first transistor having a first electrode connected to a first input terminal to which a first power supply is supplied, a second electrode connected to a first node, and a gate electrode connected to a second input terminal to which a first control signal is transmitted;
A second transistor having a first electrode connected to the first node, a second electrode connected to a third input terminal to which a second power source is supplied, and a gate electrode connected to the second node;
a third transistor having a first electrode connected to the first node, a second electrode connected to the third input terminal to which the second power is input, and a gate electrode connected to a fourth input terminal to which a second control signal is transmitted;
a fourth transistor having a first electrode connected to the first input terminal to which the first power supply is transferred, a second electrode connected to the second node, and a gate electrode connected to the first input terminal;
a fifth transistor having a first electrode connected to the second node, a second electrode connected to the third input terminal, and a gate electrode connected to the first node;
a sixth transistor having a first electrode connected to a fifth input terminal to which the touch clock signal is input, a second electrode connected to an output terminal, and a gate electrode connected to the first node; and
a seventh transistor having a first electrode connected to the output terminal, a second electrode connected to the third input terminal, and a gate electrode connected to the second node.
4. The display device according to claim 1, wherein the inactive area is provided with a gate signal generating circuit for supplying a gate signal transferred to the gate line.
5. The display device according to claim 1, wherein the substrate includes a light emitting layer and a package for packaging the light emitting layer, and the touch sensor unit is disposed on the package.
6. A display device, comprising:
a display panel including an active region in which a gate line and a data line are disposed and which includes a plurality of pixels arranged in a region where the gate line and the data line intersect each other, and a non-active region in which a touch signal generation circuit for receiving a touch clock signal and outputting a touch driving signal is disposed;
a display driving circuit for supplying driving signals corresponding to a gate signal applied to the gate line and a data signal applied to the data line;
a touch sensor unit including a plurality of touch electrodes for receiving the touch signal from the touch signal generation circuit and generating information about touch points on the display panel; and
A touch driving circuit for supplying the touch clock signal to the touch signal generating circuit, and
wherein the touch signal generation circuit receives two or more touch clock signals simultaneously and outputs touch driving signals corresponding to the two or more touch clock signals simultaneously, and
wherein the touch signal generation circuit outputs a first touch driving signal corresponding to the first touch clock and a second touch driving signal corresponding to the second touch clock simultaneously, and
wherein the touch signal generation circuit outputs the first touch driving signal and the second touch driving signal during a first time interval and a second time interval, and
the phase of the first touch driving signal is opposite to the phase of the second touch driving signal during the first time interval and is the same as the phase of the second touch driving signal during the second time interval.
7. The display device of claim 6, further comprising: and a gate signal generating circuit for receiving the driving signal from the display driving circuit and generating the gate signal.
8. The display device according to claim 6, wherein the touch signal generation circuit includes:
a first transistor having a first electrode connected to a first input terminal to which a first power supply is supplied, a second electrode connected to a first node, and a gate electrode connected to a second input terminal to which a first control signal is transmitted;
a second transistor having a first electrode connected to the first node, a second electrode connected to a third input terminal to which a second power source is supplied, and a gate electrode connected to the second node;
a third transistor having a first electrode connected to the first node, a second electrode connected to the third input terminal to which the second power is input, and a gate electrode connected to a fourth input terminal to which a second control signal is transmitted;
a fourth transistor having a first electrode connected to the first input terminal to which the first power supply is transferred, a second electrode connected to the second node, and a gate electrode connected to the first input terminal;
a fifth transistor having a first electrode connected to the second node, a second electrode connected to the third input terminal, and a gate electrode connected to the first node;
A sixth transistor having a first electrode connected to a fifth input terminal to which the touch clock signal is input, a second electrode connected to an output terminal, and a gate electrode connected to the first node; and
a seventh transistor having a first electrode connected to the output terminal, a second electrode connected to the third input terminal, and a gate electrode connected to the second node.
9. The display device according to claim 8, wherein the touch signal generation circuit does not receive the first control signal, the second control signal, and the touch clock signal from the touch drive circuit in a first time interval, and receives the first control signal and the second control signal from the touch drive circuit in a second time interval, and receives the touch clock signal and the first control signal and the second control signal from the touch drive circuit in a third time interval, and receives the second control signal and the first control signal and the touch clock signal from the touch drive circuit in a fourth time interval.
10. The display device according to claim 6, wherein the touch sensor unit is connected to the touch signal generation circuit through a plurality of touch driving lines,
wherein the touch driving circuit supplies a first touch clock signal to a first touch driving line of the plurality of touch driving lines and supplies a second touch clock signal to a second touch driving line adjacent to the first touch driving line.
11. The display device of claim 10, wherein the touch driving circuit supplies a third touch clock signal to a third touch driving line adjacent to the second touch driving line of the plurality of touch driving lines and supplies a fourth touch clock signal to a fourth touch driving line adjacent to the third touch driving line,
wherein the third touch clock signal and the fourth touch clock signal have the same phase as the first touch clock signal and the second touch clock signal, respectively, and are output to partially overlap with the first touch clock signal and the second touch clock signal.
12. The display device of claim 6, wherein a voltage level of the touch driving signal is higher than a voltage level of the touch clock signal.
13. The display device according to claim 6, wherein the display panel includes a light emitting layer and a package for packaging the light emitting layer, and the touch sensor unit is disposed on the package.
14. The display device of claim 6, further comprising: and a control unit for controlling the display driving circuit and the touch driving circuit.
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